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		<span class="header-logo header-affix margin-left-no margin-right-no" data-offset-top="213" data-spy="affix">[Usaco2004 Feb]Moo University -- Financial Aid 财政补助</span>
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                [Usaco2004 Feb]Moo University -- Financial Aid 财政补助                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;贝茜统计到人类拥有很多大学可以去就读，而奶牛们却一个大学也没有．为了解决这个问</span></div>
<div><span style="font-size: medium">题，她和她的同伴们建立了一所奶牛大学Moo大学．为了防止笨牛入学，学校的创立者搞了一个奶牛智力测试(CSAT)，它的分数在区间[1，2&times;10^9]内．Moo大学的学费很昂贵：不是所有奶牛都能负担．事实上，大多数奶牛需要一些财政帮助a(0&le;o&le;100000)．政府不会给奶牛任何资金，所以所有的资金都来自于学校有限的资金，资金总数为F(0&le;F&le;2&times;10^9).更糟的是，虽然有C(N&le;C&le;100000)头奶牛报考，Moo大学却只能接受N(1&le;N&le;19999)头奶牛，N为奇数．贝茜既要让这N头奶牛享受最大限度的教育资源，又要它们CSAT分数的中位数尽可能高．&nbsp;&nbsp;&nbsp;&nbsp;这里说一下对于一个奇数个数组成的集合中中位数的概念．例如，集合3，8，9，7，5的中位数是7，因为有两个数小于7，有两个数大于7．&nbsp;&nbsp;&nbsp;&nbsp;给出每头奶牛的分数和所需的财政补贴数，可以接纳的奶牛数，补助的资金总数，求出中位数最大的可能值．</span></div>
<div></div></p><hr/><h3>输入格式</h3><p><div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第1行：三个用空格分开的整数N，C，F.</span></div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;第2到C+1行：每行有两介用空格隔开的整数．第一个数表示这头奶牛的CSAT分数；第二个</span></div>
<div><span style="font-size: medium">整数表示这头奶牛所需的补助数额．</span></div>
<div></div></p><hr/><h3>输出格式</h3><p><div>&nbsp;</div>
<div><span style="font-size: medium">&nbsp;&nbsp;&nbsp;&nbsp;仅一行，一个整数即最大的中位数可能值．如不存在输出-1.</span></div>
<div></div></p><hr/><h3>样例输入</h3><pre>    3  5  70
    30  25
    50  21
    20  20
    5  18
    35  30
</pre><hr/><h3>样例输出</h3><pre>    35
样例说明
    如果贝茜接收CSAT分数为5，35，50的奶牛，中位数为35.总的资金要求为18+30+21=69
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Green</p>
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